Universe 2009-02-18 05:07:13 2009-02-18 05:07:13 Definition physical Universe multi-verses physical Universe multi-verses The physical \emph{Universe} is understood as the global spacetime and all its physical contents such as: matter, energy, dark matter, dark energy, gravitational fields, nuclear fields, and so on (Higgs bosons ?). Some quantum theories assume the existence of mutliple physical universes or ``\emph{multi-verses}''.